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Seismic Network in Sri Lanka

Seismic Network in Sri Lanka. IRIS workshop on “Managing Waveform Data and Related Metadata from Seismic Networks”. Hotel Windsor Suites, Bangkok, Thailand. 08-13, January, 2012. Ashvin Wickramasooriya Senior Lecturer in Earth Science South Eastern University of Sri Lanka.

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Seismic Network in Sri Lanka

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  1. Seismic Network in Sri Lanka IRIS workshop on “Managing Waveform Data and Related Metadata from Seismic Networks” Hotel Windsor Suites, Bangkok, Thailand 08-13, January, 2012 AshvinWickramasooriya Senior Lecturer in Earth Science South Eastern University of Sri Lanka

  2. CONTENTSOVERVIEWSRI LANKAN SEISMIC NETWORKSOUTH EAST SEISMIC STATION SPECIFICATIONS:SENSORS/LOGGER/SOFTWARE

  3. Overview There was no seismic network system for Sri Lanka before 2005 However, a single seismic station was established in 1996 under the Global Seismic Network (GSN) at Pallekale, Kandy First Sri Lankan Seismic Network has established in June, 2005 funded by the Japanese Government (JICA)

  4. Initial Plan of establishing this seismic network include : • Detect a domestic earthquakeand calculate • Epicenter and Magnitude • Post processing function • 3) Data communication: Telephone Line (Dial up) • (To reduce the running cost) • 4) Four Seismic Stations (To calculate Epicenter)

  5. SRI LANKAN SEISMIC NETWORK There are four seismic stations were established under this network at four universities. Local station(RJR) Rajarata Univ. Local station(EST) South-East Univ. Central Station (PRD) Peradeniya Univ. Local station(RHN) Ruhuna Univ. June , 2005 Funded by JICA

  6. Overview (Function) • Continuous Data recording (6ch, one month) • 6ch: Acceleration 3ch, Velocity 3ch • Automatic Trigger Function and Call to Central Station (Peradeniya) • 3) Automatic Data correction from Central Station to Local Station (Manual correction is also Available) • 4) Automatic Processing Function (SEISAN) • Epicenter(Domestic) , Magnitude • 5) Post Processing Function (SEISAN)

  7. Central Station (Peradeniya) Software for Central Station Data Collection from each stations Data Storage Data Analysis *Epicenter *Magnitude *Spectrum etc Maintenance (Each station ) TCP/IP Protocol Converter UNIV.LAN Personal Computer Short period seismometer Data Logger (6ch) with GPS Hub U P S Router Forcebaranse servo accelerometer Modem Printer Concrete Base Outside Inside SET Telephone Line RAJ RHN

  8. Local Stations(Rajarata, Ruhuna, South-Eastern) Software for Local station Data Collection (Own site, Manual) Data Storage (Do) Maintenance (Own site) TCP/IP Protocol Converter Personal Computer Short period seismometer Data Logger (6ch) with GPS Hub U P S Router Forcebalance servo accelerometer Modem Printer Concrete Base Outside Inside Telephone Line Central Station

  9. SOUTH EAST SEISMIC STATION • Sensor: • 1)Forcebalance Servo Accelerometer :Episensor • 2)Seismometer (1Hz Geophone):GS-1 • Data Logger: • 24bit Data Logger : Altus K2 • Data Acquisition: • PC Based System : Recording: SMARTS • Processing: SEISAN • Communication: • Telephone line (Analog, Dial-up)

  10. Sensors Accelerometer Episensor Seismometer GS-1 • Epi-sensor Suitable for Strong motion • GS-1 Suitable for Micro-seismic

  11. Data logger

  12. Site Installation Data Processing system Installation

  13. Resolution & Dynamic Range • Full scale of K2 : 2.5V • A/D resolution : 2.5V/223 = 0.298 microV • Acceleration: (0.23mgal) – 1960 gal • Effective resolution: 10 mgal ? • Velocity: (0.0745 microkine)– 625 mkine • Effective resolution: 10 microkine? • GS-1 for small earthquake • Epi-sensor for strong motion

  14. Software configuration Local Stations Central Station

  15. Thank You

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